HI Global Scaling Relations in the WISE-WHISP Survey

TL;DR

This paper establishes new, tighter global scaling relations between atomic hydrogen, stellar, and star-forming disks in nearby galaxies using combined HI and infrared data, introducing a novel enclosed-quantity approach.

Contribution

It introduces a new method of deriving scaling relations for enclosed quantities within the stellar disk, improving the tightness of the relations compared to integrated measurements.

Findings

Tighter global scaling relations when using enclosed quantities.

New HI intensity maps with robust noise rejection.

Analysis based on 228 nearby galaxies from WHISP and WISE surveys.

Abstract

We present the global scaling relations between the neutral atomic hydrogen gas, the stellar disk and the star forming disk in a sample of 228 nearby galaxies that are both spatially and spectrally resolved in HI line emission. We have used HI data from the Westerbork survey of HI in Irregular and Spiral galaxies (WHISP) and Mid Infrared (3.4 $\mu m$, 11.6 $\mu m$) data from the Wide-field Infrared Survey Explorer (WISE) survey, combining two datasets that are well-suited to such a study in terms of uniformity, resolution and sensitivity. We utilize the novel method of deriving scaling relations for quantities enclosed within the stellar disk rather than integrating over the HI disk and find the global scaling relations to be tighter when defined for enclosed quantities. We also present new HI intensity maps for the WHISP survey derived using a robust noise rejection technique along with corresponding velocity fields.